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Stability analysis of a TWT against the reflected signals using alarge-signal model.

Srivastava, V. and Joshi, S. N. and Carter, Richard G. (2000) Stability analysis of a TWT against the reflected signals using alarge-signal model. In: 2nd International ICMMT 2000 Conference on Microwave and Millimeter Wave Technology. IEEE, Beijing, pp. 80-83. ISBN 0-7803-5743-4

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    Abstract

    A large signal model is used to analyze the stability of a high gain helix TWT against the reflected signals caused by mismatches at its input and output terminations. The stability of a section of the tube in the presence of the reflected signals is determined by making a number of passes through the section for a very low drive power. A section is considered stable if the output power converges after 4 passes. If the output power goes on increasing or does not converge then the section is defined as unstable. Results are presented for a 60 W helix TWT which is designed both in a two-section and in a three-section configuration for a small-signal gain of more than 60 dB. It is shown that the two-section TWT can be made stable with 10 dB return loss at the input and output terminations, only if the tip loss profile at the sever can be designed to have a return loss of more than 30 dB. For the three-section tube, the return loss at the sever does not need to be greater than 20 dB for stable output performance.

    Item Type: Contribution in Book/Report/Proceedings
    Additional Information: ©2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE." "This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
    Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
    Departments: Faculty of Science and Technology > Engineering
    ID Code: 26835
    Deposited By: Prof Richard G. Carter
    Deposited On: 27 Jul 2009 16:14
    Refereed?: No
    Published?: Published
    Last Modified: 24 Jan 2014 05:58
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/26835

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